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- W4206404119 abstract "Nanocrystalline (NC) W metals and alloys often exhibit higher radiation tolerance and strength than their coarse-grained counterparts. However, their thermal stability is low, making it difficult to achieve bulk NC W metals and alloys by consolidation using conventional techniques such as pressure-less sintering, hot-explosive-compaction sintering, and spark plasma sintering. Here we report the synthesis and mechanical properties of bulk NC W100-xTix (x = 10 at.%–30 at.%) alloys prepared by consolidating mechanically alloyed NC powders under a high-temperature/high-pressure condition. Adding 20 at.%–30 at.% Ti largely improves the sinterability of NC W-Ti alloy powders. The room-temperature microhardness and compressive yield strength of consolidated bulk NC W80Ti20 alloy are ∼ 16.9 and 6.0 GPa, respectively, which are mainly caused by grain boundary strengthening and significantly higher than those of previously reported W and W alloys. The ultimate compressive strength of bulk NC W80Ti20 measured between 900 and 1100 °C deceases with increasing temperature. This behavior can be explained by the activation of Rachinger grain boundary sliding. No grain growth is observed in bulk NC W80Ti20 after compression at 1000 °C. Theoretical calculation suggests that it is the segregation of Ti at grain boundaries that decreases the specific grain boundary free energy and makes the NC W80Ti20 alloy thermodynamically stable." @default.
- W4206404119 created "2022-01-25" @default.
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- W4206404119 date "2022-07-01" @default.
- W4206404119 modified "2023-10-12" @default.
- W4206404119 title "Bulk nanocrystalline W-Ti alloys with exceptional mechanical properties and thermal stability" @default.
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- W4206404119 doi "https://doi.org/10.1016/j.jmst.2021.11.015" @default.
- W4206404119 hasPublicationYear "2022" @default.
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